1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8de18371c767c4d36c8bd66db2b871d63f47ce690e553135b3bf4e5fd194edfb. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/789b7ca7-6ac2-4c19-93da-691b9ac89466.json and https://artists.proofprofile.net/proofs/artist/789b7ca7-6ac2-4c19-93da-691b9ac89466.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfa1fa402a16f981800b1ad77f54784ee81823db7d25c4273add0b0ed9e1ab8f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZGLM2309469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x714c65ac1a8799b5d61246ca83ba5f0f5932d8cf41f1e81f9137557acba062de. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKXN22332758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ab1a0cce0387816ac1050783c8149c7ebf3de10a7acb3945b4c86f662340cf2. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKXN22332760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c19fec1706bbf86522e30434c55d0648783c950f1e0373808ccfee8e59f8d5b. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKXN22332761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14fc7b04376b41696cc323b921e5a04f745c7e357749e8d8acbc64604fff5a7b. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBMA22309377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fcb5f9e45f19707accf5f3910616dfe9868ffb00d54a7974a206d5cb889a931. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLFP2450377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6961b4fd5cb55f8df26779275034038e06e9dc3f63abaf3c70cf97b4cbb6e7a7. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX3Q92474572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x326ab4c5780eba8d7cc4121443988916cee882052fed0cbc095bf276dd885692. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTAY2412559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4642c2797272164360e588d4d78e69cce7781c083902811a8d1966287d8ee507. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTBD2451515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x376351f5ee90974b587b9af34f8e0dc6b6402a3088b5295638abbb4c3b16bd52. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKXN22592212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1776e48aad98786b282c24505786aa38eecae6c8d81259eb8f8d60d8761ff35f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKXN22592211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf743ed19b1ce5f7ad6a8bc6cb4ee6e9fb29db7e3b7b653de661157e1d8978a09. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T22:34:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKXN22592214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77a604608174e011331ffd42c2062cd362d074c64f12b159559d0744b124bda3. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GXHAF2556704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x990ec449c7ed35403ae7d8dde31df6d092921ac2172c317d479698c55cf9434c. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GXHUT2510824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18032227f92b19f5a0d08515b14b7700d85259b389cb9dbcee372bc50bdee2a5. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZPLS2158411.